abook is a text-based addressbook program designed to use with mutt mail client. Abook runs on Linux, FreeBSD and some other UNIXes. It features import filters for ldif, mutt alias, Pine addressbook, and export filters for ldif, Pine addressbook, HTML, mutt alias, VCard, elm alias, plaint text and Spruce address book.
Dlume is a Gtk 2-based address book. You can easily add, edit, and delete records from an XML database.
KLibreta is a KDE address book for e-mail clients.
pabber allows you to access the Exchange Global Address List and add entries to your .addressbook file.
Pine-Tools a group of utilities and a program called "contact", designed to allow Pine users to store extended contact information in the Pine addressbook. Filters to export and import Pine addressbooks in various formats are also included.
rwdaddresses is a simple little address book program using flat files. In addition to text data, contact photos can be added and viewed.
Yet Another PHP Address Book: an address entry collection system based on PostgreSQL (also can be ported to other database like MySQL), PHP and PHP PEAR. It has lots of features like: User accounts with adjustable permissions, Multi-Language support, and IM between users.